Newbie with 570 sportman

Just picked up a 2017 570 sportsman.
I notice the header pipe glows red under light loads, as in 35-40 mph going down the road. Was told this is normal until engine gets broke in?
Been driving it fairly easy, no WOT yet.

Plan on using Mobil 1 synthetic 5w40 diesel oil. Is that OK? Or should I use the 5w40 for gas engines? Was told the diesel oil has been additives?

What oil should I use for the trans and front diff.
Was told to use synthetic ATF for the front diff? That OK?
What should be used in the trans?

I read to use Purolator pl14610 oil filter. But read there was a batch of bad filters going around? Something about the filter media tearing? Or did that happen a while ago and everything is OK now?

Thanks for listening to my newbie questions! I know these questions were probably all asked before, but I read so many threads that I know less now, then when I started! Lol